P. Piot

Northern Illinois University

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John Power

Argonne National Laboratory

D. Mihalcea

Language Science (South Korea)

Eric Wisniewski

Argonne National Laboratory

Aliaksei Halavanau

SLAC National Accelerator Laboratory

François Lémery

Deutsches Elektronen-Synchrotron DESY

Sergei Nagaitsev

Thomas Jefferson National Accelerator Facility

Gwanghui Ha

Argonne National Laboratory

Jinhao Ruan

Fermi National Accelerator Laboratory

Valeri Lebedev

Fermi National Accelerator Laboratory

Charles Whiteford

Argonne National Laboratory

Cooperative Institutions

Deutsches Elektronen-Synchrotron DESY

295

Fermi National Accelerator Laboratory

275

Thomas Jefferson National Accelerator Facility

172

Argonne National Laboratory

167

Brookhaven National Laboratory

157

SLAC National Accelerator Laboratory

148

Northern Illinois University

118

Universität Hamburg

102

Lawrence Berkeley National Laboratory

European Organization for Nuclear Research

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Manipulation of the Longitudinal Profile

AIP conference proceedings (2006)

R. Tikhoplav Grigory Kazakevich D. Mehalcea P. Piot

We present studies of transverse emittances and electron beam pulse length for various operating points of the electron source: electron beam charge, laser length and spot size, and solenoid settings. We especially study the impact, on transverse emittance, of short Gaussian versus long square temporal distributions of the photocathode drive‐laser.

Photocathode

Beam emittance

Solenoid

Electron gun

10.1063/1.2409203

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Numerical Investigations of Coherent Synchrotron Radiation Driven Instability in Magnetic Bunch Compressors

T. Limberg P. Piot F. Stulle

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Tailored electron bunches with smooth current profiles for enhanced transformer ratios in beam-driven acceleration

Physical Review Special Topics - Accelerators and Beams (2015)

François Lémery P. Piot

Collinear high-gradient ${\cal O} (GV/m)$ beam-driven wakefield methods for charged-particle acceleration could be critical to the realization of compact, cost-efficient, accelerators, e.g., in support of TeV-scale lepton colliders or multiple-user free-electron laser facilities. To make these options viable, the high accelerating fields need to be complemented with large transformer ratios $>2$, a parameter characterizing the efficiency of the energy transfer between a wakefield-exciting "drive" bunch to an accelerated "witness" bunch. While several potential current distributions have been discussed, their practical realization appears challenging due to their often discontinuous nature. In this paper we propose several alternative current profiles which are smooth which also lead to enhanced transformer ratios. We especially explore a laser-shaping method capable of generating one the suggested distributions directly out of a photoinjector and discuss a linac concept that could possible drive a dielectric accelerator.

Bunches

Plasma acceleration

Photocathode

10.1103/physrevstab.18.081301

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Citations (42)

Impact of transverse irregularities at the photocathode on the production of high-charge electron bunches

M. Rihaoui C. L. Bohn P. Piot John Power

The properties of electron beams produced in a photoinjector are strongly dependent on the initial conditions, i.e. the photocathode drive laser shape and its uniformity. We explore the impact of well-defined transverse laser perturbations on the evolution of the electron beam both in configuration and velocity spaces and especially investigate how certain types of perturbations evolve as the beam propagates in the Argonne Wakefield Accelerator facility. Numerical simulations performed with IMPACT-T are presented. Finally preliminary experimental results aimed at validating our simulations are discussed.

Photocathode

Bunches

Electron gun

10.1109/pac.2007.4440048

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Planned High-brightness Channeling Radiation Experiment at Fermilab's Advanced Superconducting Test Accelerator

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2014)

Ben Blomberg C. A. Brau B.K. Choï W. Gabella B. Ivanov

In this contribution we describe the technical details and experimental setup toward the production of highbrightness channeling radiation (CR) at the Fermilab’s Advanced Superconducting Test Accelerator (ASTA). In the ASTA photoinjector area electrons are accelerated up to 40-MeV and focused to a sub-micron spot on a 168 micron thick carbon diamond, the electrons channel through the crystal and emit CR up to 80-KeV. Our study utilizes ASTA’s long pulse train capabilities and ability to preserve ultra-low emittance, to produce the desired brightness.

Fermilab

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A MULTISLIT TRANSVERSE-EMITTANCE DIAGNOSTIC CE-CHARGE-DOMINATED ELECTRON

P. Piot Jiepeng Song R. Li D. Kehne K. Jordan

Jefferson Lab is developing a 10MeV injector to provide an electron beam for a high-power free-electron laser (FEL). To characterize the transverse phase space of the space-charged-dominated beam produced by this injector, we designed an interceptive multislit emittance diagnostic. It incorporates an algorithm for phase-space reconstruction and subsequent calculation of the Twiss parameters and emittance for both transverse directions at an update rate exceeding 1 Hz, a speed that will facilitate the transversephase-space matching between the injector and the FEL's accelerator that is critical for proper operation. This paper describes issues pertaining to the diagnostic's design. It also discusses the acquisition system, as well as the software algorithm and its implementation in the FEL control system. First results obtained from testing this diagnostic in Jefferson Lab's Injector Test Stand are also included.

Beam emittance

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Generation of Modulated Bunch Using a Masked Chicane for Beam-Driven Acceleration Experiments at ASTA

6th Int. Particle Accelerator Conf. (IPAC'15), Richmond, VA, USA, May 3-8, 2015 (2015)

Youngmin Shin D. Broemmelsiek Darren Crawford Andrew Green Alex Lumpkin

10.18429/jacow-ipac2015-mopma051

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Bunch shaping in electron linear accelerators

Reviews of Modern Physics (2022)

Gwanghui Ha K.-J. Kim John Power Y. Sun P. Piot

Electron beams from modern high performance accelerators power intense light sources such as free electron lasers and synchrotron light sources, as well as wakefield-based accelerating modules relying on plasmas or dielectric structures. The way the electron bunches are shaped in space and time controls the efficacy of how the electron beam radiates or interacts with structures. In this review the physics behind methods for controlling the mesoscopic electron-bunch properties, i.e., phase-space distributions, from an electron accelerator are discussed, from both a theoretical and an experimental perspective. The focus is on phase-space shaping methods relying on bounded external electromagnetic fields or self-generated velocity and radiation fields, and how they are implemented.

Mesoscopic physics

Accelerator physics

10.1103/revmodphys.94.025006

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Citations (19)

Electron-bunch Shaping for Coherent Compton Scattering

5th Int. Particle Accelerator Conf. (IPAC'14), Dresden, Germany, June 15-20, 2014 (2014)

Jamison E. Thorne P. Piot Ivan Viti

10.18429/jacow-ipac2014-thpro033

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DEVELOPMENT OF SHORT UNDULATORS FOR ELECTRON-BEAM-RADIATION INTERACTION STUDIES

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2016)

P. Piot Matthew Andorf G Fagerberg Michael Figora A. Sturtz

Interaction of an electron beam with external field or its own radiation has widespread applications ranging from coherent-radiation generation, phase space cooling or formation of temporally-structured beams. An efficient coupling mechanism between an electron beam and radiation field relies on the use of a magnetic undulator. In this contribution we detail our plans to build short (11-period) undulators with 7-cm period refurbishing parts of the aladdin U3 undulator [1]. Possible use of these undulators at available test facilities to support experiments relevant to cooling techniques and radiation sources are outlined.

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